21368627 has 4 divisors (see below), whose sum is σ = 24421296. Its totient is φ = 18315960.

The previous prime is 21368617. The next prime is 21368629. The reversal of 21368627 is 72686312.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21368627 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21368629) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1526324 + ... + 1526337.

It is an arithmetic number, because the mean of its divisors is an integer number (6105324).

Almost surely, 2^21368627 is an apocalyptic number.

21368627 is a deficient number, since it is larger than the sum of its proper divisors (3052669).

21368627 is an equidigital number, since it uses as much as digits as its factorization.

21368627 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3052668.

The product of its digits is 24192, while the sum is 35.

The square root of 21368627 is about 4622.6212261011. The cubic root of 21368627 is about 277.4973708595.

The spelling of 21368627 in words is "twenty-one million, three hundred sixty-eight thousand, six hundred twenty-seven".